Maserati GranTurismo Top Speed: The Maserati GranTurismo S 4.6 V8 - [2008] has a top speed of 183 mph (294.5 kph) Maserati GranTurismo Acceleration: This GranTurismo accelerates 0-60mph (96.6 kph) in 4.9 seconds or 0-100kph in 5.1 and can achieve an estimated 1/4 mile drag time in 13.55 seconds with a trap speed of 100.9 mph.